Royal Caribbean’s ‘Icon of the Seas’ Shows Cruises’ CO2 Problem

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When Royal Caribbean’s Icon of the Seas embarks on its first official voyage on Jan. 27, the journey is sure to make waves. The world’s largest cruise ship, the Icon is over 1,000 feet long (360 meters) and weighs in around 250,000 gross registered tons. It boasts 20 different decks; 40 restaurants, bars and lounges; seven pools; six waterslides and a 55-foot waterfall. Royal Caribbean says its boat will usher in “a new era of vacations.”

Maybe so. But the Icon is also a doubling ...